Bag forming and sealing machine



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BAG FORMING AND SEALING MACHINE Filed June 12, 1958 7 sheets-Sheet 5 vzl ya H. H- STYERS BAG FORMING AND SEALING MACHINE Oct. 27, 1959 7Sheets-Sheet 6 Filed June 12, 1958 INVENTOR. BY 5%) 594/15.

Oct. 27, 1959 H. H. STYERS BAG FORMING AND SEALING MACHINE 7Sheets-Sheet 7 Filed June 12, 1958 United States Patent C M BAG FORMINGAND SEALING MACHINE Henry H. Styers, Chicago, Ill., assignor to Poly-CutCorporation, Chicago, 111., a corporation of Illinois Application June12, 1958, Serial No. 741,554

18 Claims. (Cl. 93-8) This invention relates to improvements in themanufacture of bags, or like containers and more particularly toimproved apparatus for the high-speed production of open mouth bags invariable sizes from a web of polyethylene, or other similar flexiblematerial, having a heat-fusible surface, wherein the web of material isfed to the machine as center fold material, or tubing, and bags formedtherefrom by successive longitudinal edge sealing and severingoperations.

The present invention does not include any steps directed to folding ofa single web of material to form the center fold material used, or tosteps for closing the open mouth of the bags after formation of sideseals therto, as these operations may be accomplished by conventionalmechanisms.

In the art of manufacturing bags, it has been standard practice to formelongated bag tubes, cut into desired lengths and thereafter to formbags therefrom by sealing the bottoms, but at least with certain typesof stock, the sealing of the bottom of the bag has presented seriousdifficulties.

Also, it has been standard practice to provide an apparatus for themanufacture of bags which is adapted to advance the web intermittently,thereby allowing time for effective and positive sealing steps and whichis also adapted to maintain tension upon the web at all times during theforming operations, whereby considerable time is lost in the productionof the bags.

The prior art machines do not provide means for highspeed production ofbags with a folded bottom, having definite and positive longitudinalside seals, nor is apparatus suggested which permits the production uponcenter fold material of a wide range of bags sizes, variable as to bothwidth and height, and also variable as to a pro jecting lip portion atthe mouths of the bag.

Accordingly, it is an object of this invention to provide a newapparatus for the manufacture of relatively air separate the newlyformed bags, or containers, immediately after formation of same.

Another object of the invention is .to provide a machine with a heatsealing roll in contact with a movable belt, which, by means of simplegear changes andadjnstments,

. the speed of the heat sealing roll is varied in relation to the speedof the belt conveying the heat sealing material,

the variation of the speed of the heat sealing roll relative to thespeed of the belt provides a wide range of bags sizes, variable as toboth width and height.

Further objects and details will appear from the description of theinvention in conjunction with the accompanying drawings, wherein:

2,909,969 Patented Oct. 27, 1959 Figure 1 is aside elevational view of abag making machine embodying the present invention;

Figure 2 is a fragmentary front end view of the machine of Figure 1,with parts of the tension mechanism and roll of material in section;

Figure 3 is a fragmentary longitudinal sectional view taken on the lineHIIII of Figure 5;

Figure 4 is a fragmentary longitudinal sectional view taken on line IVIVof Figure 2, the rear end portion broken away and placed in an elevatedlocation;

Figure 5 is a fragmentary top plan view of the machine of Figure 1,parts removed, taken substantially on line V--V of Figure 4;

Figure 6 is a schematic diagram of the electrical circuit embodied withthe machine of Figure 1; I

Figure 7 is a fragmentary elevational sectional view through the gearhousing taken substantially on line VII VII of Figure 8;

Figure 8 is a fragmentary sectional view taken substantially on lineVIII-VIII of Figure 7;

Figure 9 is a fragmentary sectional view taken substantially on lineIX-IX of Figure 7;

Figure 10 is a fragmentary longitudinal sectional view of the heatsealing roll with center shaft and parts associated therewith; v

Figure 11 is an enlarged end view of one end of the heat sealing rollwith some parts in'section;

Figure 12 is an enlarged end view of the heat sealing roll, oppositethat shown by Figure 11, showing a four lobe cam attached thereto andthe micro-switch being shown by dotted lines; v

Figure 13 is a fragmentary sectional end view of the sealing roll andcam taken substantially on line XIII- XIII of Figure 12.

In the drawing, the numeral 15 designates an elongated strip of thinflexible thermo-plastic sheet material, such as polyethylene. Theelongated strip is unwound from roll 16 where it is arranged as a centerfold material, or tubing if so desired. The roll 16, as best illustratedin Figure 2, is mounted upon a supporting and tensioning mechanism 17.The roll 16 of flexible material 15 is wound upon a hollow core 18 withflared ends. The tensioning mechanism is supported by the framework 20enclosed inside the sheet. material cover C of the bag making machine25. A shaft 21 is mounted transversely of the frame 20 upon a frameextension 22, shown by Figures 1 and 2, and journalled in bearings '23and 24. Said shaft 21 embodies left and right handed threads, the lefthanded threads 26 at one end portion and the right handed threads 27 atthe opposite end portion thereof. Supporting arms 28 and 29 are threadedat their upper ends upon said shaft 21. The lower ends of said armsbeing apertured to receive a shaft 30. Two truncated cones 31 and 32 aremounted upon said shaft 30 with their smaller ends arranged forinsertion within the hollow end portion of said core 18. The handwheel33 is assembled and rigidly secured to one end of said shaft 21. Therolls 16 and core 18 are assembled upon the cones 31 and 32 which areloosely mounted upon shaft 39. Friction washers 19 are assembled betweenthe cones 31 and 32 and the respective supporting arms 28 and 29. Byturning the hand-wheel 33 clockwise the arms 28 and 29 move toward eachother pressing the washer 19 against the cones 31 and 32 whereby theyare pressed into the ends of said core 18 to regulate the desiredtension of the material leaving the roll 16 mounted on said cones.

As the center fold material 15 is unwound from roll 16 it is fed overidler roll 35 rotatably mounted upon shaft 36 extendingtransversely ofthe frame 29, shown by Figures 4 and 5. The web 15 is fed downwardly andaround an idler roll 37 rotatably mounted upon shaft 38 2,909,969 H p rand then upwardly and over an idler roll 39 rotatably mounted upon shaft40. The web 15 is then fed horizontally beneath a feed compressionroller 41 on shaft 42, and then upwardly between the feed roller 41 andthe endless belt 45. Said shafts 36, 38 and40 are all suitablyjournalled in said frame 20 of the machine. The end portions of saidshaft 42 extend through lateral slots 46 arranged in both sides of theframe 20. Square journal blocks 47 and 48 are mounted upon the ends ofsaid shaft 42 and are assembled with the end portions of compressionscrews 51 and 52 extending rearwardly through threaded nuts 53 and 54welded to the framework 20. A pair of hand wheels 55 and 56 are rigidlysecured to the outer ends of said compression screws 51 and 52 toincrease or decrease the pressure of the feed roller 41 upon thematerial 15 in running contact with the belt 45. The belt 45 withdrawsthe material 15 from roll 16 according to the pressure of thecompression roller 41 biasing the material 15 into contact therewith.

When the pressure upon the material is relieved, the material is notwithdrawn from the roll 16. The rollers 35, 37, and 39 in rollingcontact with the material as it travels thereabout remove all wrinklesand looseness of the material before it reaches and contacts the belt45.

A motor 60 is adjustably mounted upon the lower portion of said frame20, shown by Figure 4. A drive pulley 62 is mounted upon motor shaft 61.A driven pulley 63 is mounted upon the end portion of a trans- '20 andthe near end of the shaft extends outside the machine frame as shown byFigures 3 and 5. A pinion gear 68 is secured to said shaft 67 andbecomes the driving pinion for driving the intermediate spur gear 69mounted on shaft 70, said intermediate gear 69 driving the gear 71mounted on the near end of shaft 72, said shaft 72 extendingtransversely of the machine with its opposite end extending beyond theframe of the machine at the opposite side; said shaft 72 beingjournalled in bearings 58 and 59 for supporting and driving the beltdrive roller R, shown by Figures 2 and 5. A spur gear '73 is mountedupon the far end portion of shaft 72 for driving gear 74 mounted uponstub shaft 75 arranged parallel with shaft 72, as shown by Figures 4 and5. A floating shaft 75-A is assembled at one end thereof to anadjustment arm 81, pivotally mounted at one end to shaft 75, said shaft75-A arranged parallel to said stub shaft 75 and having its free endextending outwardly beyond the end of shaft 75. A pair of pinion gears76 and 77 are assembled upon shafts 75 and 75-A in mating relation witheach other. Shaft 75 drives gear 76 which drives the gear 77, shown byFigures 7 and 8. Said gear.

77 is pinned to said shaft 75-A which drives a speed control gear 78removably mounted upon the end portion of said shaft 75-A. Said gear 78being locked upon shaft 75-A by a circular locking nut 88.

Directly above the shaft 72 is mounted in suitable bearings 85 and 86the shaft 80 for supporting the heat sealing roller S transversely ofthe machine. A speed control spur gear 79 is removably assembled uponthe far end portion of said shaft 80 and clamped thereon by a threadedcircular nut 83 screwed upon the extreme outer end of said shaft 80. Theadjustment arm is moved upwardly to effect mating of the speed controlgears 78 and 79 and then locked in place. The free end of said arm has athreaded stud-shaped bolt 87 secured thereto. A timing gear housing H isassembled to the rear side of the machine to completely cover said gears78 and 79 and associated parts. A b19915 8g is secured to the frame ofthe machine and is formed with an arcuate slot 89 substantiallyvertically arranged therein, said block spaced from the wall of themachine to provide suitable space to permit movement of the enlargedhead portion 90 of said stud-shaped bolt. Once the gears are in matingrelation, the circular lock-nut 88 is screwed inwardly to lock the bolt87 extending through the slot 89 with the inner wall of the block 82.When it is desirable to exchange gears of different size for gears 78and 79, as will be explained later, the arm 81 is lowered to permitlowering and removal of gears 78 and 79.

The housing H is provided with a door 91 vertically arranged andhingedly connected thereto by hinges 92. At the side opposite the hinges92 a locking means is provided embodying a locking pin 93. A safetyswitch 94 is assembled within the housing H with its operating member-95extending outwardly and effected by the opening and closing of the door91. If and when the door 91 is opened, the electric circuit is brokenleading to the drive motor 60, as shown by Figure 6.

The endless belt 45 mounted to play over belt roller R extendsrearwardly and in a downwardly inclined plane and about roller 74mounted upon transversely arranged shaft 75 journalled in bearings 76and 77. The bearings 76 and 77 are connected with tension rods 78 and78-A and secured in place by locking nuts 73. Said belt 45 and rollers Rand 74 encircled by said belt 45 are driven by said shaft 72.

The web 15 traveling between the roller R and sealer roller S isconveyed under feed roller arranged close to the belt and transverselyof the machine frame 20. As shown by Figures 4 and 5 said roller 100 isrotatably mounted upon shaft 101 supported in the free end portions ofbracket arms 102 and 103. The opposite ends of the bracket arms 102 and103 are pinned to end portions of a shaft 104 mounted transversely ofthe machine and secured in journals 105 and 106 secured in brackets 107and 108 secured to an angle bar 109 extending transversely of themachine and rigidly secured to the machine frame above the plane of thebelt by side brackets 110 and 111. Said roller 100 is provided with aspiral groove extending from end to end thereof, the outer surface ofthe roller 100 being in pressing engagement with the web 15 upon thebelt 45, the weight and pressure of the roller acting to keep the web 15in contact with the belt for conveying the web to the jogger rolllocated at a distance from said roll 100.

The jogger roll 112 is rigidly mounted upon a shaft 113 arrangedparallel with shaft 101. The shaft 113 is mounted in bearings 119 and inthe free end portions "of the arms 114 and 115 which are mounted withtheir opposite ends thereof pinned to shaft 116, said shaft 116 beingtransversely mounted in the machine in bearings 117 and 118 which aresupported in the bearing brackets 121 and 122. Said shaft 113 has agrooved cam 123 mounted upon one end thereof between the arm 115 and theframe 20. A depending pin the 124 is supported by a bracket 125 securedto the frame 20 adjacent and above said cam 123. The lower end portionof said pin 124 rides loosely in the groove of the cam 123 as the camrotates due to rotation of said roll 112 and shaft 113, said shaft 113and roll 112 are given an alternating transverse motion. Upon theopposite free end of shaft 113 is mounted a rather small sprocket 135. Asprocket 'transverse motion thereof effects a lateral motion to thesevered web portion 15-A upon the belt 45 for purposes to be explainedlater.

Between the jogger roll 112 and the rear roll 74 supporting the belt 45is arranged a high speed shaft 126 mounted in bearings 127 and 128, saidshaft 126 having contact rollers 130, 131, 132 and 133 rigidly securedthereon and spaced at desired locations therewith. Said rollers 130-133are adjustably secured to said shaft 126 by set screws 138. The bagsealing and severing mechanism 140 includes said shaft 81) and saidsealing roller S vertically arranged above said shaft 72. Said sealingroller S is suitably supported upon said shaft 81 and comprises threecircular disks 142, 143, 144, two arranged to form the ends thereof, andone centrally located between said other disks. The disks areconstructed of electrical insulation and heat resisting material. Disks142 and 144 are keyed to said shaft 80 by keys 145 in key-ways arrangedin said shaft, as shown by Figure 11. The rotation of the gear 79 willrotate said shaft 80, the disks 142, 143 and 144 and parts associatedtherewith. The disks 142, 143 and 145 have a plurality of laterallyarranged slots arranged therein. As shown by Figures 11 and 12, eachdisk is provided with four slots, 146, 147, 148, 149 with parallel sidewalls and equally spaced about the periphery thereof. At the base ofeach said slots is radially arranged a circular bore 154 with acylindrical sleeve 151 arranged therein to surround a compression spring152 assembled in each .of said bores 150. Said disks 142, 143 and 144are supported by the shaft 30 to further support the heat sealing andbag severing bars 153-156 as sembled in said slots 146-149, whereby theyare ar ranged parallel and longitudinally with said shaft 80. Each ofsaid bars 153-156 has a longitudinal bore 157 extending from end to endthereof. A cylindrical rod 158 is mounted in each of said bores 157 withthreaded ends thereof extending beyond each end of said bars 153- 165. Acommutator ring is arranged at each end of said sealing roll S, spacedtherefrom only by washers 173. A commutator ring 169 with bifurcatedradially extending arms 171 is rigidly secured to one end of each ofsaid bars 153-156 by nuts 172 arranged upon the threaded ends of saidrods A commutator ring 170 is similarly arranged at the opposite end ofsaid bars 153-156 by nuts 172.

The heat sealing bars 153-156 have parallel longitudinal side walls 185and 136 and a flat base 134 formed at right angles to said side Walls.The outwardly extending working portion of each bar has an inverted Vshaped surface 188 with a narrow longitudinal sealing edge portion. Theheat sealing bars 153-156 are normally held within the slots 146 by bar15% and nuts .172. Adjacent each of said bars and formed with each slotin the end disks 142 and 144 is provided 'a cavity 196. Each bar has asmall recess 189 in its side wall adjacent the cavity in the associatedslot. A resilient spring 191 having a depending portion 192 is securedat its upper end 193 within each of said cavities, its lower free end192 projecting into said recess in the bars. When'it is desired toremove one or more bars ,to make bags of larger diameter, the nuts 172are loosened, the spring 191 in the adjacent cavities 190 are depressedand the bar withdrawn with the assistance of the compression spring .152in contact with the base of the bar.

The commutator rins 159 and 170 are also secured to the respectivesupporting disks 142 and 144 by suitable [screws 175, as shown by Figurell.

Adjacent the commutator rings 17% and suitably spaced therefrom is afour lobe earn 175 with a central aperture '177 to allow said shaft 80to extend therethrough, clearly .shown by Figure 12.

sealing roller S. Said brackets support brushes, or pins '182 and 183resiliently mounted horizontally therewith so that the free outer endsthereof frictionally engage the commutator rings 169 and 170. Pin 18?.is electrically 6 a connected to one line of an electric circuit and pin183 is connected to the opposite line of the electriccircuit. Thecurrent traveling through the bars 153-156 will produce sufiicient heat,at or about 600 F., to effect heat sealing and heat severing of themultiple layer bag operated upon. As shown by Figure 4, the heat sealingroller S is shown slightly elevated above the belt 45 running over beltdrive roller R. The shaft is journalled in bearings and 86 which areresiliently and adjustably mounted in vertical guides 56 and-57 in theupper portion of the sides of the frame 20. Said bearings 85 and 86 restupon the upper ends of coil springs 43 and 44 which are mounted upon theupper sides of bearings 58 and 59, respectively. The adjusting screws 96and 97 are threaded into the upper ends of the frame standards and thebearings 85 and 86 are moved upwardly by the screws 96 and 97 whenturned in one direction and when the screws are turned in the otherdirection, the springs 43 and 44 are compressed and the bearings 85 and86 are lowered, whereby the sealing roller S is adjusted upwardly ordownwardly with relation to the belt roller R.

The shaft 275 and roller 274, and the shaft 72 and belt drive roller Rare mounted in substantially a horizontal plane, as shown by Figure 4.Due to the fact that the roller 274 is smaller in diameter than theroller R, the plane through which the belt travels is inclineddownwardly from the roller Rto roller 274. This inclination is veryimportant and will be explained later. I

Three main control buttons are mounted with switches upon the frame ofthe machine, a start button and switch 210, a stop button and switch211, and a selector button and switch 215. The selector switch is turnedbetween hand operated station HO and automatic station A. i

.In order to use four sealing bars as shown in the draw ings, a fourlobe cam 17 6 is shown and is secured to the end of the sealing rollerdisk 144 by screws 200, the lobes of the cam are designated by numeral201, 202, 203 and 204. When power is applied by the motor 60, thesealing roller S is rotated, and it is important that the roller S neverstop with a sealing bar in contact with the web material or belt on theroller R. Therefore, a microswitch 205 is secured upon the frame 20 bysuitable means, as shown by Figures 4 and 12. Said microeswitch 205 hasembodied therewith an actuating arm 206 with I idler 207 upon the outerend thereof. .Any one of the lobes of the cam 1456 will strike theroller 207, move the arm 266 which closes the micro-switch 205, allowingcurrent to travel through the electrical circuit as long as the lobe ofthe cam holds the arm in circuit closing position. Since the lobes arein radial alignment with the sealing bars, the sealing bars will alwaystravel to a location and stop at a location relative to and intermediatethe lobe positions of the cam 176. Therefore, each time the power istransmitted by pressing the starting button 210 the sealing bar willrotate one quarter of a revolution. A stop switch actuated by stopbutton 211 is inserted within the circuit to cut off all current andstop the rotation of the sealing roller S. Two additional switches, aselector switch 215, and an inching switch 212 are mounted adjacent thestop switch 211 and the start switch 210. When the inching switch 212 isactuated by pressing upon plunger 214 the power will be applied and themachine will run continuously if the selector switch 215 is in automaticposition or it will allow the machine to stop if selector switch is inhand control position and the plunger released. The inching switch 212acts as a starting switch when selector switch is in automatic position.When the stop button 211 is depressed the micro-switch 205 will againfunction and it governs the location of the sealing bars when the rollerS stops rotating.

The operation of the machine is as follows: The bag material is drawnfrom the roll 16 thereof and fed over roller 35, under roller 37, overroller 39, between compression rollers 41 and belt roller R, between thebelt 45 playing about roller R and the sealing roller S along the top ofthe belt 45 under feed roller 100. When the machine is 'placed inoperation by depression of the starting button 210 the formed bagsleaving the sealing and severing roller S will travel along the beltandunder the jogger roller 112, along the belt, and under the high speedrollers 130-134, whereby the formed bags are ejected onto conveyor 220.Said conveyor is constructed with two shafts 221 and 222 at the forwardend and two shafts 223 and 224 at the rear end thereof, one above theother. The conveyor unit is driven by a separate power unit not shown, abelt 25 drives a sprocket 226 which drives shaft 224 in acounter-clockwise direction and said shaft 224 driving shaft 223 in acounter-clockwise direction by pinion gears engaged with each other andsecured to said shafts 223 and 224. Conveying means, as for exampleendless spiral springs, are mounted upon pulleys mounted upon the frontand rear shafts, whereby the completed bags are conveyed to the endthereof and discharged from the conveyor unit.

With the sealing roller equipped with four sealing and severing bars andthe gears 78 and 79 within the housing H of such a combined gear ratiothat the speed of rotation of the sealing roller S is the same as thespeed of rotation of the belt roller R, four bags will be formed duringeach revolution of the sealing roller S. The width of each bag will beexactly A the circumference of the sealing roller. By changing thegear-ratio between the gears 78 and 79 the speed of rotation of thesealing roller S will be varied with relation to the speed of the filmtraveling along the belt 45 over the roller R. By turning the lock nut88 to relieve the pressure upon the adjustment arm 81, said arm can belowered thereby separating said gears 78 and 79 and permitting theremoval and substitution of gears of a different gear-ratio. The downward slope of the belt permits a gear ratio variation of 10% between thegears 78 and 79 without any destruction, or sliding action of the barsupon the bag material, in other words the width of the bags can beincreased or decreased l% with the same number of sealing bars. Theinclination of the belt shortens the length of time of .contact betweenthe heating bars and the bag material upon the belt. The inverted shapeV heating surface of the bars being provided with the narrowlongitudinal seal edge effects sealing of the layers of materialtogether and severs the adjacent portions thereof, thereby providingsealed edges to the adjacent bags. A increase .or decrease, will allowan increase, or decrease, of 1" in the width of the bags formed by asealing roller S with a fifteen inch diameter.

When it is desired to make a bag twice the width as obtained when usingfour sealing bars, two of the bars vsuch as 153 and 150, spaced atopposite sides of the sealing roller S can be removed by removal of thenuts 172 from the rods 158, removal of the washers 173 between thecommutators 169 and 170 and the bars 153 and 155,

then complete removal of the rod 158 and finally the depression ofspring 191 whereby the springs 152 will force the bars outwardly. Shoulda bag be desired with a width four times the original width with a fourbar sealer, then three of the bars can be removed; and an additionalvariation of one inch, or about 10%, can be ,made by changing the sizeof the speed control gears 78 and 79.

Should it be desired to make several bags of a shorter length, and atthe same time, the roll 16 can be made of less width, and several rollsbe placed in alignment upon the supporting shaft 21, and the severalwebs of the safety switch 95 breaking the circuit and preventing .anypower from being applied to the machine by motor 60. For furtherprotection, a service switch 216 and a .reset-switch 217 are installedahead of the switch box enclosing the switches 210, 211, and 215, asshown by Figures 1 and 6 of the drawings.

Should the speed of the power unit need to be changed for reasons ofproduction, the speed of the pulley 63 can be changed with relation tothe speed of the motor shaft 61 by turning the handle 227 of the ReevesSpeed Control device 228 supporting the motor 60 upon horizontal rods229 mounted with the machine frame 20.

The above description has been chosen with relation to center foldmaterial for making bags with a closed lower end and sealed side wallsand open upper end. It is obvious that tubular material may be used toform vbags closed at both ends with sealed side edges; the bags .itsclosed tubular side walls, providing two webs of material to be fedthrough the machine and constructing two bags at one time with closedends, sealed side walls and the length desired.

It will be understood that while I have illustrated and described oneembodiment of my invention, I do not wish to be limited to this precisestructure as obviously various modifications and changes may be madetherein without departing from the spirit and scope of my invention.

I claim as my invention:

1. A bag machine as described, including means for supporting a roll ofbag-making web material with a center fold to form a bag, an endlessbelt extending about a drive roller and a driven roller, roller meansfor pressing 'a portion of said web material into contact with said beltadjacent said drive roller, a sealing roller mounted about said driveroller for contacting web material in contact with said belt, saidsealer roller having a plurality of spaced sealing bars for sealing andforming the sides of the bag, roller means for retaining the bags uponthe moving belt in juxtaposition, a jogger roll in rolling contact withsaid formed bags on the belt for applying transidrive roller andsevering roller are power operated by an electric motor, and embodying amicroswitch operated by a cam assembled adjacent said sealing roller,the actuation of said switch by said cam effecting the closing of theelectric power circuit connected with said motor, the microswitchcontrolling the location of the bars when idle so they do not stop incontact with the belt.

4. A bag machine according to claim 1 wherein said drive roller and saidsealing roller are power operated by an electric motor, said motormounted upon an adjustable base effecting the speed of the belt driveassociated therewith, and embodying a pair of speed control gearsenclosed in a housing with a door, a safety switch embodied between saiddoor and said housing whereby opening of the door will break theelectric power circuit.

5. A bag machine according to claim 1 where the driv roller and saidsealing roller are power operated by an electric motor, said motormounted upon an adjustable base effecting the speed of the belt driveassociated therewith, and embodying a microswitch operated by a camassembled adjacent said sealing roller, the actuation of said switch bysaid cam effecting the closing of the electric power circuit connectedwith said motor, the microswitch controlling the location of the barswhen idle so they do not stop in contact with the belt.

6. A bag machine as described, including means for supporting a roll ofbag-making web material formed with a center fold to form a bag, anendless belt extending about a drive roller and a driven roller, rollermeans for pressing a portion of said web material into contact with saidbelt adjacent said drive roller, a sealing roller mounted above saiddrive roller for contacting web material in contact with said belt, saidsealer roller having a plurality of spaced sealing bars for sealing andforming the sides of the bag, a jogger roll in rolling contact with saidformed bags on the belt for applying transitory motion to said formedbags thereon, and roller means for ejecting the formed bags from themachine.

7. A bag machine as described, including means for supporting a roll ofbag-making web material formed with a center fold to form a bag, anendless belt extending about a drive roller and a driven roller, rollermeans for pressing a portion of said web material into cont-act withsaid belt adjacent said drive roller, a sealing and severing rollermounted above said drive roller for contacting web material in contactwith said belt, said sealer roller and severing roller having aplurality of spaced common sealing and severing bars for sealing andforming the sides of the bag and for severing the bags, roller means forre taining the bags upon the moving belt in juxtaposition, a jogger rollin rolling contact with said formed bags on the belt for applyingtransitory motion to said formed bags thereon, and roller means forejecting the formed bags from the machine.

8. A bag machine as described, including means for supporting a roll ofbag-making web material to form a bag, an endless belt extending about adrive roller and a driven roller, means for pressing a portion of saidweb material into contact with said belt adjacent said drive roller, asealing and severing roller mounted above said drive roller forcontacting web material in contact with said belt, said sealer andsevering roller having a plurality of spaced unitary sealing andsevering bars for sealing and forming the sides of the bag and forsevering the bags by heat, roller means for retaining the bags .upon themoving belt in juxtaposition, a jogger roll in rolling contact with saidformed bags on the belt for applying transitory motion to said formedbags upon said' belt, and roller means for ejecting the formed bags fromthe machine.

9. A bag machine as described, including means for supporting a roll ofbag-making web material formed with a center fold to form a bag, anendless belt extending aboutz a drive roller and a driven roller, meansfor pressing a' portion of said web material into contact with said beltadjacent said drive roller, a sealing roller mounted above said driveroller for contacting web material in contact with said belt, saidsealer roller having a plurality of spaced sealing bars for sealing andforming the sides of the bag, a common power means for driving saiddrive roller and a pair of speed control gears, said speed control gearsdriving said sealing roller, the gear-ratio of said gears determiningthe speed of rotation of said sealing roller relative to said belt,roller means for retaining the bags upon the moving belt injuxtaposition, a jogger roller in contact with said formed bags on thebelt for applying transitory motion to said formed bags thereon, andmeans for ejecting the formed bags from the machine.

10. A bag machine according to claim 9 and having said pair of speedcontrol gears enclosed in a housing with a door, one of said speedcontrol gears movably mounted upon an arm pivotally mounted at one endand adjustably secured at its opposite end with a bolt secured in ablock attached to the machine, said block having a curved slot thereinand within which said locking bolt is movable to engage or disengagesaid speed control gears with each other, a safety switch embodiedbetween said door and said housing whereby opening of the door willbreak the electric power circuit.

11. A bag machine according to claim 9 and having one of said speedcontrol gears movably mounted upon an arm pivotally mounted at one endand adjustably secured at its opposite end with a bolt sliding in ablock 10 Y attached to the machine, said block having a curved slottherein and within which said locking bolt is movable to engage o-rdisengage said speed control gears with each other, a microswitchoperated by a cam assembled adjacent said sealing roller, the actuationof said switch closing the electric power circuit, the microswitchcontrolling the location of the bars when idle so they do not stop incontact with the belt.

12. A bag machine as described, including means for supporting a roll ofbag-making web material formed with a center to form a bag, an endlessbelt extending about a drive roller and a driven roller, means forpressing a portion of said web material into contact with said beltadjacent said drive roller, a sealing and severing roller mounted abovesaid drive roller for contacting web material in contact with the beltthereon, said sealer and severing roller having a plurality of commonradially spaced and removable sealing and severing bars for sealing andforming the sides of the bag and for severing the bags, power means fordriving said drive roller and a pair of speed control gears, said speedcontrol gears driving said sealing and severing roller, said speedcontrol gears removable and replaceable, the gear-ratio of said gearsdetermining the speed of rotation of said sealing roller relative tosaid belt, roller means for retaining the bags upon the moving belt injuxtaposition, a jogger roller in contact with said formed bagstraveling on the belt for applying transitory motion to said formed bagsthereon, and roller means for ejecting the formed bags from the machine.

13. A bag machine as described, including means for supporting a roll ofbag-making Web material to form 'a bag, an endless belt extending abouta drive roller and a driven roller, means for pressing a portion of saidweb material into contact with said belt adjacent said drive roller, aheat sealing and severing roller mounted above :said drive roller forcontacting Web material in contact with said belt, said sealer andsevering roller having a plurality of spaced common heat sealing andheat severing bars for sealing and forming the sides of the bag and ,forsevering the bags, power means for driving said drive roller, a pair ofspeed control gears connected with said fpower means, said gears drivingsaid sealing and severing :roller, the gear-ratio of said gearsdetermining the speed ,of rotation of said sealing roller relative tothe speed of 'the material traveling on said belt, roller means forretaining the bags upon the moving belt in juxtaposition, a

,jogger roller in contact with said formed bags. traveling with saidbelt for applying transitory motion to said formed bags, and means forejecting the formed bags from the machine.

14. A bag machine as described, including means for supporting a roll ofbag-making web material formed with a center fold to form a bag, a driveroller, a driven roller, an endless belt extending about said driveroller and said driven roller, means for pressing a portion of said webmaterial into contact with said belt adjacent said drive roller, asealing and severing roller device mounted above said drive roller forcontacting the web material in contact with said belt, said sealing andsevering roller device embodying a plurality of spaced heat sealing andheat severing bars, said bars being supported by and removable fromsaid'sealing and severing roller device, an electric motor for drivingsaid drive roller, a pair of speedrcontrol gears mounted between saidmotor and said sealing and severing roller, the number of bars upon saidsealing roller and the gear-ratio of said speed control gearsdetermining the width of the bag, roller means for retaining the bagsupon the moving belt in juxtaposition, a jogger roll in rolling contactwith the formed bags on the belt for applying transitory motion to theformed bags thereon, and roller means for ejecting the formed bags fromthe machine.

15. A bag machine as described, including means for supporting a roll ofbag-making web material formed with a center fold to form a bag, a largedrive roller, a small driven roller, an endless belt extending aboutsaid drive roller and said driven roller, the upper surface of said beltrunning in a downwardly extending plane with reference to thehorizontal, means for pressing a portion of said web material intocontact with said belt adjacent said drive roller, a heat sealing andsevering roller unit mounted above said drive roller and in contact withthe web material on the belt, said sealing roller unit embodying aplurality of spaced sealing and heat severing bars, said bars beingsupported by and removable from said sealing and severing roller unit,an electric motor and electric current from a suitable circuit fordriving said drive roller, a pair of speed control gears mounted betweensaid motor and said sealing and severing roller, the number of'bars uponsaid sealing roller and the gear-ratio of said speed control gearsdetermining the size of the bag, said bars heated by electric currentconveyed by said suitable circuit, said speed control gears mountedwithin a closed housing embodying a door, a safety switch closed by saiddoor when in closed position, the opening of said door opening saidsafety switch preventing operation of the motor, a jogger roll inrolling contact with the formed bags on the belt for applying transitorymotion to the formed bags thereon, and roller means for ejecting theformed bags from the machine.

16. A bag machine as described, including means for supporting a roll ofbag-making web material formed with a center fold to form a bag, a driveroller, a driven roller, an endless belt extending about said driveroller and said driven roller, adjustable roller means for pressingaportion of said web material into contact with said belt adjacent saiddrive roller, a heat sealing and heat severing roller unit mounted abovesaid drive roller and in contact with the web material on the belt, saidsealing roller unit embodying a plurality of spaced heat sealing andheat seven'ng bars, said bars being supported by and removable from saidheat sealing and severing roller unit, an electric motor connected withan electric circuit for driving said drive roller, a pair ofspeed-control gears arranged in the power drive between said motor andsaid sealing and severing roller unit, said gears mounted in a housingattached to said machine, said housing having an entrance door, a safetyswitch actuated by said door, opening of said door breaks the circuitfurnishing current to said motor thereby preventing operation of themachine when the door is open, the number of bars upon said sealingroller and the gear-ratio of said speed control gears determining thewidth of the bag, said bars heated by electric current conveyed by saidelectric circuit, roller means for retaining the bags upon the movingbelt in juxtaposition, a jogger roll in rolling contact with the formedbags on the belt for applying transitory motion to the formed bagsthereon, and means for ejecting the formed bags from the machine.

17. A bag machine as described, including means for supporting a roll ofbag-making web material formed with a center fold to form a bag, a driveroller, a driven roller, an endless belt extending about said driveroller and said driven roller, the upper surface of said belt operatingin a downwardly inclined plane with respect to the horizontal,adjustable roller means for pressing a portion of said web material intocontact with said belt adjacent said drive roller, a heat sealing andheat severing unit mounted above said drive roller and in contact withthe web material on the belt, said sealing roller unit embodying aplurality of spaced heat sealing and heat severing bars, said bars beingremovably supported with said heat sealing and heat severing unit, anelectric motor and drive means connected with said drive roller, anelectric circuit controlling said motor, a pair of speedcontrol gearsarranged with the power drive means between said motor and said driveroller, said gears driving said heat sealing and heat severing roller, aselector switch mounted adjacent said heat sealing and heat severingroller and operated thereby, said selective switch governing theinoperative location of the bars to prevent same from stopping incontact with material on said belt, the number of bars upon said sealingroller and the gearratio of said speed control gears determining thewidth of the bag, roller means retaining the bags upon the moving beltin juxtaposition, a jogger roll in rolling contact with the formed bagson the belt for applying transitory motion to the formed bags thereon,and means for ejecting the formed bags from the machine.-

18. A bag machine as described embodying a heat sealing roller and aplurality of heat sealing bars, a motor, a microswitch operated by a camassembled adjacent said sealing roller, the actuation of said switch bysaid cam efiecting the closing of the electric power circuit connectedwith said motor, the microswitch controlling the location of the barswhen idle so they do not stop in contact with the belt.

References Cited in the file of this patent UNITED STATES PATENTSWillersdorf Sept. 5, 1916

